Due to numerous land reforms the land use in Estonia has been changed thoroughly. Land units from 1940 and cadastral units formed through land reform are studied in two study areas from Ülenurme and Rõngu parishes. At this time as we know, this subject has been researched only slightly. The aim of this master’s thesis is to create methodology, which can be used to compare land units from year 1940. and cadastral units formed through land reform, to find out the influence of land reform to land fragmentation. Geographic information systems were used to analyse the data. Methodology was created, but it was discovered that its’ negative sides are huge time expenditure and low level of automation. Within test areas the number of land units has increased 2-4 times and the average size of the land units has decreased 2-4 times. Through applying the methodology it resulted, that land fragmentation caused by land reform has occurred. It was also discovered, that borders of land units from 1940 and cadastral units formed in land reform mostly do not coincide. One option to develop the methodology further, would be to increase the level of its automation. Methodology, developed in this master’s thesis, could be used to study other areas in Estonia. Results from those studies could be used to make general statements about land fragmentation caused by land reform in Estonia.